B
Bob I
Let's just leave it at you're welcome to my style of tech support.OK, now I have to love you forever.
On booting just now, the Security Essentials icon failed to appear, and
I succeeded in getting it back using your method.
A second possible method of recovering "icons" is "killing" and then
restarting "explorer.exe" in effect completely rebuilding the desktop.
after you are logged on.